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Deferred Acquisition Costs and Other Actuarial Balances - Disaggregated DAC amounts (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Deferred Acquisition Costs |  |  |
Deferred acquisition costs | $ 4,006.9 | $ 3,950.5 |
Short-duration contracts |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 30.6 | 31.1 |
Other balances |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 5.9 | 7.7 |
Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 957.2 | 918.9 |
Retirement and Income Solutions | Workplace savings and retirement solutions |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 515.5 | 506.4 | $ 498.0
Retirement and Income Solutions | Individual variable annuities |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 323.4 | 279.5 | 278.0
Retirement and Income Solutions | Pension risk transfer |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 21.1 | 15.4 | 8.1
Retirement and Income Solutions | Individual fixed deferred annuities |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 84.2 | 106.1 | 131.0
Retirement and Income Solutions | Investment only |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 13.0 | 11.5 | 14.9
Benefits and Protection |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 3,043.8 | 3,023.9 |
Deferred acquisition costs excluding short-duration contracts and other balances | 3,013.2 | 2,992.8 |
Benefits and Protection | Specialty Benefits | Individual disability |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 696.9 | 667.7 | 626.1
Deferred acquisition costs excluding short-duration contracts and other balances | 696.9 | 667.7 |
Benefits and Protection | Life Insurance | Universal life |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 1,527.7 | 1,545.3 | 1,569.7
Deferred acquisition costs excluding short-duration contracts and other balances | 1,527.7 | 1,545.3 |
Benefits and Protection | Life Insurance | Term life |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 710.8 | 695.1 | 685.7
Deferred acquisition costs excluding short-duration contracts and other balances | 710.8 | 695.1 |
Benefits and Protection | Life Insurance | Participating life |  |  |
Deferred Acquisition Costs |  |  |
Deferred acquisition costs | 77.8 | 84.7 | $ 93.0
Deferred acquisition costs excluding short-duration contracts and other balances | $ 77.8 | $ 84.7 |

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